Welding wire



A. M. ROSS WELDING WIRE March 8, l1949.

3 Sheets-Sheet l Filed Nov. l5, 1945 A. M. ROSS vWELDING WIRE March 8, 1949.

3 Sheets-Sheet 2 Filed Nov. 15, 1945 A. M. ROSS WELDING WIRE March 8, 1949.

l3 Sheets-Sheet 3 Filed Nov. l5, 1945 Patented Mar. 8, 1949 WELDING WIRE Albert M. Ross, Westmont, lll., assignor of onehalf to William S. Gilpin, La Grange, Ill., and one-half to National Cylinder Gas Company, Chicago, Ill., a corporation of Delaware Application November 15, 1945, Serial No. 628,711

(Cl. 2l9-8 11 Claims.

The present invention relates to flux-coated welding Wire or rods that may be used in fusion welding, as by gas or electric arc Welding, in any length, as in short length form, or in coil form, for continuous and automatic Welding, and the like.

Among the objects of the invention is to provide a novel device or means which has a longitudinal core, which may be of metal, or fusible material, a sheathing of molded ux material on the core, and longitudinally-extending metal, or the like, strip or strips in contact with the core, mainly imbedded in the iiux material, and having spots or areas of Contact With the core, and also having exposed spots or areas of Contact at or outwardly of the surface of the ux material sheathing for making contact with an electrical sheathing, or the like, of metal, fusible material, carbon, or the like, in which the Welding rod or wire a Whole is fed during use. The strip or strips mentioned may be composed of Waveshaped, undulated, bent, looped, or otherwise congurated metal, or like elements, and may be composed of a primary strip contacting the core and imbedded in the flux material sheathing, and a secondary strip contacting the primary strip and imbedded in the flux material sheathing except at spots or loci having substantial spot or area portions exposed at or just outside of the outer surface of the fiux material sheathing to make contact with the electrode sheathing referred to above.

Welding devices of the fusion type, Whether of the gas, carbon-arc, or metallic-arc type, operate from the production of heat. In the flux-coated wire type of Welding means, it is desirable and necessary to have means for shielding the molten metal during welding; to blanket and retard the cooling rate so as to obtain high Weld physicals; to have a uniform concentric ux coating,` which in some cases may be as small as 1% of the weight of the Welding rod or Wire, and in other cases may be as great as 30% of the Weight of the Welding rod or Wire; to be externally flux coated: to have reinforcement to permit exing and also coiling of the wire, as on a reel from which the wire is fed when in use; to be capable of being subjected to external pressure, by any feeding means, when welding Without the flux becoming distorted or displaced; and to have a combinative structure for alloying. In the case of metallic arc welding, the device must be capable of using current contacting means, such as an exterior electrode sheathing, or the like, with which the welding means will have substantial area spot or loci Contact rather than mere point Contact; also capable of free passage or path of current to an through the core or mass, and to have an axial arc characteristic which will remain axial and not float or Waiver.

Heretofore, extruded or dipped ux coating has not permitted coiling of the Welding rod or Wire, as a Whole, as on a reel; has not been uniformly concentric, it being impossible and impraoticable to obtain and to maintain uniform concentricity; has not had definite means for controlling the ratio of ux in the Welding rod or wire as a Whole; had no exterior contacting means; had a rotating or unstable arcing characteristic; and had mere point contact rather than spot and area contacts. Such welding Wires had notches or grooves for carrying the uxing material, braided casings, or helical Wrappings imbedded in the fluxes, and sheathed or encased Welding wires or those contained within the bore of the rod.

The present invention comprehends simple means possessing all of the above mentioned advantages and avoiding all of the disadvantages heretofore present; a Welding wire which meets the requisites of all Eux-coated welding Wires that may be used in all fusion welding, Whether gas, or electric arc, in manual, semi-automatic or fullautomatic welding apparatus.

I have discovered that I can use longitudinal strips, as primary strips, or as both primary and secondary strips, simply laid along the core, and these strips are preferably of wave or undulated form, or bent or otherwise congurated, or of tortuous form, and that the laps or bites of the Waves, undulations, bends, or the like, may be in planes radial to the axis of the core, or in planes parallel to such axis, or in curved surfaces about or around the core, or the like, and that such strips are merely superposed on the core or upon each other without any interlacing or intermeshing, or intervveaving, or inter-braiding, or the like. Each strip may simply rest along the surface of the core, or be partly imbedded in the core, to run parallel to the axis of the core, be irnbedded Within the core, as in planes including the axis of the core7 or in planes parallel to the axis of the core, or surfaces concentric withsuch axis, as partly or fully around the core, and With right and left lag, or overlay or overlap, or in combinations of them.

Other objects, advantages, capabilities, features and the like are comprehended by the invention as will later appear, and as are inherently possessed by the invention.

Referring brieiiy to the drawings:

Figs. 1, 3, 5, 7, 9, 11, 13, 15, 1'7, 18, 20, 22, 25, 27, 28, 29 and 30 are side views with parts broken away of segments of different forms of Welding wires constructed in accordance with the invention;

Figs. 2, 4i, 6, 8, 10, 12, 14, 16, 19, 21, 23, 26 and 31 are transverse sectional views taken in planes represented by lines 2 2, @-5, 6 6, 8 8, IUI0, l2-l2, ifi-Mi, Iii-l5, is-IS, 2I-2I, 23-23, 213-26 and si-Eil taken respectively in Figs. 1, 3, 5, 7, 9, 11, 13, l5, 17, 20, 22, 25 and 30 of the drawings; and

Fig. 24 is a View of a part before application in place as shown in Fig. 25.

Referring more in detail to the drawings, the several embodiments Chosen to illustrate the invention are shown as comprising a central metal, carbon, or similar core, which is in the form of a round or cylindrical rod or wire I as shown in Figs. 1, 2, 3, 4i, 3.7, 18, 19, 22, 23, 25, 26, 27, 28, 29, 30 and 31; or in the form of a rod or wire 2 which is of polygonal form, as square or rectangular, in cross section, as shown in Figs. 5 and 6; or in the form of a rod or wire 3 that is round or circular in cross section and having longitudinal channels or flutes il, as shown in Figs. 7 and 8; or in the form of a rod or wire 5 that is of polygonal form, as square or rectangular, in cross section and having longitudinal channels or flutes 6, as shown in Figs. 9 and 10; or in the form of a rod or Wire 'l which is of oval or like cross sectional form, as sho-wn in Figs. 11 and 12; or in the form of a rod or wire 8 which is of polygonal form, as square or rectangular, in cross section, as shown in Figs. 13 and 14, or in the form of rods or Wires 9, El which are segmental or part-round in cross section, as shown in Figs. 15 and 16; or in the form of rods or wires i [i which are segmental, or semi-circular; or half round, in cross section, as shown in Figs. 2() and 2l.

Referring to the forms shown in Figs. 1-10, inclusive, upon the central core I, 2, 3 or 5, are dis posed primary strips or members as in the nature of longitudinal metal rods or wires II (Figs. 1 and 2), ifi (Figs. c and al, f3 (Figs. 5 and 6), I4 (Figs. 7 and 8), and i5 (Figs. 9 and 10). All these rods or wires are preferably of wave form, or undulated, bent, longitudinally, and have trough portions H. Il', i8, l? and 2Q respectively of the rods or Wires il, i2. i3. Ill and I5, and these trough parts or portions are in intimate contact with the surface or surfaces of the core or rods I, 2, 3 and 5 for good conduction of the electrical current when welding, and these rods or wires I I, I2, i3, id and i5 also have crest parts or portions 2i, 22. 23, 2li and 25 respectively. Along the rods or wires Il, I2. I3 or l5 is a secondary strip or member such as outer metal rod or wire 26 which may be of helical form or wavy and curved so as to have traversing bites or laps 21 thereof in good contact with the troughs I 6, Il, I8 and I9 of the rods or Wires Il, I2, I3 and I5, as shown in 1, 2, 3, 4, 5, 6, 9 and l0.

Referring to Figs, 1 and 2, it will be noted that the primary longitudinal rods or wires I I are arcshaped in cross section so as to afford a large area contact with. the core I in the trough portions I6 of the rods or wires i i. At the crests 2| the outer surface portions of these portions 2l also offer a large area surface for good and extended contact with the electrode sheathing (not shown) in which the welding rod or wire, as a whole, is fed during use.

Referring to Figs. 3 and 4, the primary longitudinal rods or wires I2 may be generally round in cross section but at the trough Il, Where there is contact with the core I, the trough portions Il are preferably flattened to offer an area of contact with the core l, and the crest portions 22 are also preferably flattened to offer an area of contact with the electrode sheathing (not shown) in which the welding rod or wire, as a whole, is fed during use.

Referring to the form shown in Figs. 5 and 6, the primary longitudinal rods or Wires I3 may be generally of oval shape or the like in cross section with the trough portions I8 having large area contact With the core 2, and with the crest portions 23 having a large area contact with the electrode sheathing (not shown) in which the welding rod o-r wire, as a whole, is fed during use.

Referring to the form shown in Figs. 9 and 10, the primary longitudinal rods or wires i5 may be round in cross section and the trough portions 28 thereof fit into the channels or flutes 5 with a large area contact with the base of the channels or flutes 6 and hence the core 5, and the crests are preferably flattened to offer large area contact with the electrode sheathing (not shown) in which the welding rod or wire, as a whole, is fed during use.

Referring to Figs. '7 and 8, the primary longitudinal rods or wires i4 are preferably of square or rectangular cross sectional form and have the troughs i9 thereof fitting with a large area contact in the channels or flutes 4 of the core 3, and the crests 2li thereof also offer large area contacts with. the electrode sheathing (not shown) in which the welding rod or Wire as a whole is fed during use.

Upon the core I, 2, 3 or 5 and about the rods or wires II, I2, I3, I4 or I5, and the rods or Wires 26, is molded flux material '28 so that the rods or wires II, I2, I3, I4 and I5, as also the rods or Wires 26, are imbedded therein except for the crests 2I, 22, 23, 24 and 25 and also the bites 21 of the rod or wire 2G, which are exposed at or slightly above the outer surface of the flux sheathl ing 28 for affording contact with the electrode sheathing (not shown) in which the welding rod or wire as a whole is fed during use.

In Figs. 3 and 4, by reason of the secondary rod or wire 25 being helical, its outer surface portion 21 is exposed at or slightly beyond the outer surface of the uX material sheathing 28.

Referring to Figs. 11 and 12, the core 'I is shown as of ovate or elongated form in cross section with opposed flat or substantially flat faces 29, 29, and on or against these faces '29, 29 are disposed primary elongated metal members or strips 38, 30 which are of wave form, undulated, bent, or otherwise configurated with the bites or convolutions 3i thereof lying in a plane or planes so as to lie flat against the faces 29 of the lcore l. Around or about these members 1 and .':ifl is a secondary or outer metal elongated member (i2 which may be of helical form with the convolutions 33 thereof crossing over the laps or bites 3I of the members 30 and being in good contact therewith and firmly holding the primary strips or members 38 in intimate contact with the core l.' In this form, as in the forms shown in Figs. 1-10, also is provided molded ilux material 28 which is so disposed that the surface portions 34 of the member 32 will be exposed at or outside of the-outer surface of the flux maten'al sheathing 28. Also, the primary members 30 have bends or lobes 35 which are exposed at or outside of the outer surface of the iiux material sheathing 28, for affording contact with the electrode sheathing (not shown) in which the welding rod or Wire as a Whole is fed during use.

Referring to Figs. 13 and 14, the core 3 is of polygonal form, as square or rectangular, in cross section, and has opposed flat or substantially nat surfaces or faces 36, 36 and on these faces 36 are disposed elongated metal strips or members 31 which may be of wave or undulated or bent form with the convoiutions thereof lying in planes so as to lie flat against the sides 39 of the core 38. The member 31 is shown to be polygonal in cross section, as square or rectangular, so that it will have flat faces or substantially flat faces in contact with the flat faces 35 of the core 8. About or around these members 8 and 31, as in the forms shown in Figs. 1-12, is provided molded flux material 28, and the members 31 have bends 39, a portion of which is exposed at or extends out beyond the outer surfaces of the flux material sheathing 28, for affording contact with the electrode sheathing (not shown) in which the welding rod or Wire as a whole is fed during use.

Referring to Figs. and 16, the core 9, 9 is shown as composed of rods or Wires which are segmental or part round in cross section with internally opposed iiat or substantially at faces 40, 40 spaced apart, and in between them and in contact with the faces 49, 49 is a primary elongated metal strip or member 4| which is preferably of wave form or undulated, or bent, and also of polygonal form, as square or rectangular, in cross section with the convolutions or laps 42 of the strip 4| lying in a plane so that they lie fiat and in contact with the faces 40, 40, of the core parts 9, 9. This primary strip 4| has bends 43 which are exposed at or extend outwardly beyond the outer surface of the flux material sheathing 28 surrounding the welding rod or Wire, as in the forms shown in Figs. 1 14. About or around the core 9, 9 and the primary strip or member 4| is a secondary longitudinal strip or member 44 which may be of helical or like form with the convolutions 45 thereof in contacting engagement with the `core parts 9, 9 so to the latter in contact with the primary strip or member 4|. The convolutions 45 of the strip 44 are disposed to have the outer part 46 thereof exposed at or outside of the flux material sheathing 29 to afford contact with the electrode sheathing (not shown) in which the welding rod or wire as a Whole is fed during use.

Referring to Figs. 2O and 21, the core I9, |11 is shown as composed of rods or wires which are segmental or halferound in cross sectional form with internally opposed fiat or substantially fiat faces 41, 41, spaced apart, and in between them and in contact with the faces 41, 41 is a primary elongated metal strip or member 48 which is preferably of wave or undulated form or of bent form, with laps 49 and bends 5B, and being substantially round in cross section, with the convolutions or laps 49 of strip 48 lying in a plane so that they lie flat and in Contact with the faces 41, 41 of the core parts lil, il?. The contacting sides of the laps 49 may be flattened to aiford large area contact with the faces 41, 41. This primary strip 48 has bends 59 which are exposed at or extend outwardly beyond the outer surface of the flux material sheathing 28 surrounding the welding rod or wire as in the forms shown in Figs. 1 16.

Referring to 17, 18 and 1.9, the core. rod or wire i is round or cylindrical in forni and has extending along the surface thereof a primary elongated metal strip or member 5| which is pneferably of wave form or undulated, or bent,

and also transversely curved to partly surround' and clasp the core this strip or member comprising bites, laps or convolution-s 52 curved about the core and having apical portions 53 at the ends of the bites or laps, or: the like, 52, as shown in Figs, 17, 18 and 19 of the drawings. On one side of the core, as shown in Fig. 17, the bites or laps, or the like, 52 lie transverse such side while also curving around it, and the apical portions 53 extend over to thel opposite side of the core On the core is the flux material sheathing 28, as in the forms shown in Figs. 1-16, and Figs. 19, 20 and 2l and in this sheathing the strip or member 5| is imbedded. Extending along and upon this strip or member 5| is a secondary elongated metal strip or member 54, which is also preferably of wave, or undulated, or bent form having transversely and curved bites, laps, undulations or bends 55 to partly surround and clasp the primary strip or member 5|, and also having at the ends of these bites or laps 55 api-cal portions 5b which extend over to the opposite side of the core i and adapted to overlie and contact the apical parts or por tions 53 of the primary strip or member 5|. The secondary strip or member 54 has its outer sur-faceportion 51 exposed at or extending outwardly beyond the outer surface of the flux Inaterial sheathing 28 surrounding the welding rod or wire l, and the primary strip or membe 5|, to afford contact with the electrode sheathing (not shown) in which the Welding rod or wire, as a wfhole, is fed during use.

Referring to Figs. 24, 25, 26, 27 and 28, the core rod or wire l is of round or cylindrical form and has extended along the surface thereof a primary elongated metal strip or member 58 having laps o-r bites 59 and Sil which ane curved transversely of the core to partly surround it to clasp it, and these laps run to bends 6| and 6?., as shown morel particularly in Fig. 24, which shows the strip o-r ymember 55 before it has been curve-d around the core i. On the rod or wire l, as in the other -gures of the drawing, is a flux material sheathing 28, which partly or in the main imbeds the strip or member 58, so as to leave, as shown in Figs. 25 and 27, outer surface parts or portions exposed at or extending outwardly beyond the outer surface of the sheathing Z8 to afford contact with the electrical sheathing (not shown) in `which the welding rod or wire as a whole is fed during use. In Fig. 28 is shown a secondary strip cir member 54 eX- tending along and over the primary strip 58 and having laps or bites 65, corresponding to the laps or bites 59 and 8d shown in Fig. 24, and which are curved to cross over or lie transversely of th or bites 59 and. of the primary strip 5S underneath the strip or member (see Fig.

El. This strip E4 in all respects is the same as the strip but is overlaid upon the strip 58 in inverse relation so :that the ybites of the to thing (not shown) which the welding rod or wire as whole fed during use.

form shown in Figs. 22 and 23 is similar to the form shown in Fig, 28, and as has on the core rod or wire a primary elongated' 7 metal strip or member 'l0 composed of loop portions ll which are arranged in staggered relation and laterally curved to partly or mainly lap around or clasp the core rod or wire i, and to be imbedded in the flux material sheathing 28.'

Upon this strip or member 'l0 is a like and secondary strip or member l2 also having loop parts or portions i3 which are arranged in staggered relation and laterally curved to partly or mainly lap around or lclasp the primary strip or member '50, but so offset that the loops "i3 will extend transversely over the loops il of the strip or member "E0, the strip or member 'l2 has exposed portions 'lf3 at or extending outwardly beyond the outer surface of the flux material sheathing 253 surrounding the welding rod or wire l, and the primary strip o-r member l0, to afford `contact with the electrode sheathing (not shown) in which the welding rod or wire as a whole is fed during use.

Referring to Fig. 29, upon the core rod or wire l, preferably of round or cylindrical form, is provided a primary metal strip or member 01 of wave forni or undulated or bent to provide laps or convolutions iid and apical parts or portions 09, as shown in Fig. 29, and this strip or member 61 is preferably wound lhelioally around the core rod or wire l, and is so imbedded in the flut; material sheathing 23 as to be exposed at or oute wardly beyond the outer surface of the flux material sheathing 23 to afford contact with the electrode sheathing (not shown) in which the welding rod or wire as a whole is fed during use. Referring to Figs. 30 and 3l, upon the core rod or wire i, which is of round or cylindrical form, is provided a primary metal strip or member 'lli of wave form or undulated or bent to provide laps or bites l and ll, with bends or apical portions 18, as shown in Fig. 30, and this strip or member l5, as a whole, is preferably wound in somewhat helical fashion or the like around the core rod or wire l, so that the laps or bites 'l0 and ll may extend or be distributed in a general direction along the core l. This strip or member 'i5 is embedded in the ilux material sheathing provided on the core il Upon this strip or member 'l5 is provided a secondary metal strip or member 19 of wave form or undulated or bent to provide laps or bites and Ei with bends or apical portions 02, and this strip or member 'l0 is preferably wound in somewhat helical fashion or the like aro-und the strip or member 'l5 so that the laps or bites 8E will traverse or cross the laps or bites 10, and the laps or bites 8l will traverse or cross the laps or bites l'l. rEhe secondary strip or member "l0 is so imbedded in the flux material sheathing 28 on the core l and the strip 'l5 as to expose portions iid of the laps or bites 80 and 3i at or outwardly beyond the outer surface of the flux material sheathing 28 to afford contact with the electrode sheathing (not shown) in which the welding rod or wire as a whole is fed during use. In all the forms above described, where the primary metal strip or member contacts with the metal core rod or wire, and also conta-cts with the secondary strip or member, while the contacts are suicient for transmitting of the electrical current; if desired such contacts may be spot welded at the loci of Contact, so that the primary may be spot welded to the core and the secondary may be spot welded to the primary strip, but such welding is not deem-ed essential. The extent of the lobes or laps or the like of the elements of the strip in whatever direction of extendingr thereof, whether transversely, arcuately, 'at an angle or angles to the axis of the core or length of the strip, or even helically about the core, or as of the secondary about the primary, controls the amount of linx material that may be used and also acts as reinforcement for the flux sheathing, as well as to hold the same in place or relation with the welding wire or rod as a whole, as it is wound on a reel or the like,- and in the case of using metallic strips or elements whereby exposed portions are located to effect electrical conduction, the same acts to maintain the contact portions in proper position for effecting the desired electrical Contact when feeding the welding wire or rod as a whole through the electrode sheathing during the welding operation. Thus, uniform concentric ux coating or sheathing of any amount of material may be secured and maintained, permitting pressure feeding. The combining of metallic core or cores, with the wave-shaped or undulated forms of the strip element or elements, with or without enwrapping metallic element or elements affords facile means of alloying.

Preferably, the flux material or coating, or sheathing, on the core, or the like, is contained or dispersed between and among the elements of the strip or strips, extending to but not covering the exposed spots or area portions which serve as contact loci for efficient electrical current conduction.

The form, as to the transverse cross sectional shape of the element or elements of the strip or strips may be as desired, such as round, oval,l square, rectangular, elongated, flat-like, trapezoidal, and the like, and may be of such forms before forming the element or elements and the longitudinal strip forms, and the desired area of the contact portions, may be effected as by a slight reduction of the nished transverse or cross-sectional shape or dimensional extent of the element of the strip. As for example, when using round wire, a diameter of it be reduced in the order of 0.004" to 0.006 to result in an area or areas of contact which would not be the usual point or line Contact. be effected when drawing the wire through the drawing die. As a further illustration, if the welding wire be used which has a normal diameter of 0.250" it can be so drawn through the drawing die or dies so that the component diameter may be 0.245" so that such would result in producing contact areas or the like approximately in the order of 0.030l by 0.015 with subsequent enlarged contact areas. Hence, point or like contact is avoided with its unsatisfactory effects. i

While I have herein described and upon the drawings shown several embodiments of the invention, it is to be understood that the invention is not limited thereto but comprehends other constructions. details, arrangements of parts,l features, and the like, without from the spirit of the invention,

Having thus disclosed the invention, l claim :i

l. A welding wire of the character disclosed and which has an elongated core with an enveloping sheathing of flux material, an elon# gated strip extending longitudinally of the core and substantially embedded in the sheathing, which strip is of tortuous form to extend about opposite sides of the core and having portions thereof in contact with the core, and a second strip extending longitudinally of the core and in superposed relation to said rst eiongated strip and substantially embedded in the iiux sheathing with portions of said second elongated strip exposed at the surface of the ilux sheathing.

2. A welding Wire of the character disclosed and which has an elongated core with an enveloping sheathing of flux material, an elongated strip extending longitudinally of the core and substantially embedded in the flux sheathing, which strip is of tortuous form to extend about opposite sides of the core and having portions thereof in contact with the core, and a second strip extending longitudinally of the core and in superposed relation to said first elongated strip and substantially embedded in the flux sheathing with portions oi said second elongated strip exposed at the surface of the flux sheathing and in which said second elongated strip is of tortuous form to extend about opposite sides of said first elongated strip in superposed relation thereto.

3. A Welding Wire of the character disclosed and which has an elongated core with an enveloping sheathing of ux material, an elongated strip extending longitudinally of the core and substantially embedded in the flux sheathing, which strip is of tortuous form to extend about opposite sides of the core and having portions thereof in contact with the core, and a second strip extending longitudinally of the core and in superposed relation to said rst elongated strip and substantially embedded in the ux sheathing with portions of said second elongated strip exposed at the surface of the flux sheathing and which has portions thereof disposed in traversing overlay on portions of said first strip.

4. A welding wire of the character disclosed and which has an elongated core with an enveloping sheathing of flux material, and an elongated strip extending longitudinally of the core and substantially embedded in the flux sheathing, which strip is of bent form to provide laps extending laterally of the length of the strip, and having portions of said laps in contact with said core.

5. A Welding Wire as set forth in claim 4 and in which the contacting portions of said laps have substantial areas of contacting surface for affording substantial areas of contact with said core.

6. A Welding wire of the character disclosed and which has an elongated core With an enveloping sheathing of flux material, and an elongated strip extending longitudinally of the core and substantially embedded in the flux sheathing, which strip is of bent form to provide laps extending laterally of the length of the strip, and having portions of said laps in contact with said core, and a second elongated strip extending longitudinally of the core and composed of an element which is of bent form to provide laps extending laterally of the length of said second strip and having portions of said laps exposed at the surface of said flux sheathing.

7. A Welding wire as set forth in claim 6 and in which the contacting portions of said laps have substantial areas of contacting surface.

8. A Welding wire as set forth in claim 6 and in which said laps are curved to extend across a side of said core and to opposite side portions of said core.

9. A Welding wire as set forth in claim 6 and in which said laps are curved to extend across a side of said core and to opposite side portions of said core and also in which said laps of said strips are disposed for the laps of the second strip traverses the laps of the first strip.

10. A Welding wire as set forth in claim 6 and in which the contacting portions of said laps have substantially areas of contacting surface and in which said laps are curved to extend across a side of said core and to opposite side portions of said core.

11. A welding wire as set forth in claim 6 and in which the contacting portions of said laps have substantially areas of contacting surface and in which said laps are curved to extend across a side of said core and to opposite side portions of said core, and also in which said laps of said strips are disposed for the laps of the second strip traverses the laps of the rst strip.

ALBERT M. ROSS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,387,157 Jones Aug. 9, 1921 1,517,311 Motte Dec. 2, 1924 1,525,840 Weed Feb. 10, 1925 1,699,438 Meinhardt Jan. 15, 1929 1,734,932 Weed Nov. 5, 1929 1,768,998 Ross July l, 1930 1,980,890 Tompkins Nov. 13, 1934 2,430,701 Bernard Nov. 11, 1947 FOREIGN PATENTS Number Country Date 415,035 Great Britain Aug. 14, 1934 

